when i get my pet rat is out her cage shes (wispa) fine and play full and runs around, while her sister just sits on the cage opening waiting for her to come back, and when both go back in wispa starts biting the bars all around the cage but the other doesn't
any ideas???

they want to get out my guinea pigs do that they want to get to my girl gp

my girl Sadie chews on the cage bars after/during in-cage play time. If I give her a treat and then ignore her and pay attention to the other rat she'll chew the bars until I give her attention. But unless I'm right there, usually giving treats, she won't do it. The other girl hasn't ever chewed.

Wispa probably just wants back out and is looking for a way, but her sister is content inside the cage so no reason to chew :)